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Greetings everyone! We located your site doing a google. A few years back we came across a thread and a few of you were discussing a rare navigation device called an Equi-angulator. No one in the thread had ever seen one before. Well, we have one and wondered if anyone in this forum would be interested in seeing pictures of it? Ours was manufactured by the famous Labs of David w. Mann Precision instruments and for the US Army Air Force. As far as our research it looks like it was made during WW2 or shortly thereafter. Our email is amandayy[at]comcast.net THANKS everyone! great Day! Jeffrey ps.....if you go back to October 13 2009 one of your members gives a great explanation of how this device works.